OF SUEVEYING INSTRUMENTS. 



Go 



Brass Pocket 



420. 4 inch. 



422. 6 inch. 



423. 8 inch. 



FIG. 426. 

 FIG. 416. 

 Levels, with adjusting screws, in maroon cases (fg. 420) : 



6 



424. 10 inch. 



425. 12 inch. 



18 

 1 5 



7 

 10 

 13 



426. Spirit Levels (fg. 426), mounted in mahogany frames, with brass plates, 6 inch., 



3s. ; 8 inch., 3s. 8d. ; 10 inch., 4s. 6d. ; 12 inch. . . 066 



427. CLINOMETER LEVEL, brass, 6-inch., with level, sights and graduated arc, for 



determining inclination of strata, etc., etc., in neat case with socket for staff, 

 (fig. 427), p. 66 1 14 



428. CLINOMETER LEVEL, as above, 9-inch., available also for draining and levelling, 



2 15 



429. PLAIN DRAINAGE LEVEL, with sights, spring adjustment beneath, brass-pointed 



tripod stand in mahogany case, Ordnance pattern . . 450 



430. BurrelPs Reflecting Level, in maroon case . . . 15 



431. Surveyor's Cross, octagonal form (fig. 431), p. 66 . . 10 



432. SURVEYOR'S CROSS, with movable head, and divided circle and compass 2 2 



433. SURVEYOR'S CROSS, with ball and socket . . 2 10 



434. Surveying Square or Pantometre (brass), with compass, telescope, and rackwork, 



divided body with screw adjustment, inverted divided semicircle, and level 



triangular base with adjusting screws, in case, with tripod stand 500 



434*. SURVEYING SQUARE OR PANTOMETRE, as above, with universal joint, without 



stand . . . . . . 400 



435. OPTICAL SQUARES, for showing right angles . . 15s. 6d, to 1 1 O 

 The last six instruments are useful for setting out perpendiculars and horizontals, the 



optical square in particular being very portable ; a survey involving right angles only may be 

 effected very expeditiously by it. 



LEVELLING STAFFS, 



With Foreign or English Graduations. 



436. Levelling Staff, Sopwith's, 14 feet, 3-draw, brass mounted, of best make 2 5 O 



437. SOPWITH'S LEVELLING STAFF, as above, 16 feet . . 2 15 O 



438. SOPWITH'S LEVELLING STAFF, as above, with socket fittings, 3-joint 3 O 



